Port-au-Prince , Haiti -LRB- CNN -RRB- -- In the week since a 7.0-magnitude earthquake shattered this capital and jolted observers around the world , authorities have buried 70,000 bodies , about a third of the estimated final toll , officials said Tuesday .

Prime Minister Jean-Max Bellerive told CNN 's Christiane Amanpour that at least 72,000 bodies had been recovered , a figure that did not include the unknown number of bodies buried by families or collected by the U.N. peacekeeping mission here .

It was unclear how many of the dead had been identified prior to burial and how many of those burials occurred in mass graves . `` We know that bodies have been buried , we feel inappropriately , '' said Dr. Jon Andrus , deputy director of the Pan American Health Organization . He cited lack of refrigeration as a complicating factor .

`` Despite all our efforts , situations , circumstances are such that we are disappointed in many cases on how this has been managed , beyond everybody 's control , '' he said . iReport : Search list of the missing and the found

PAHO , which is coordinating the health-sector response , offered a preliminary estimate of 200,000 dead .

At least 28 of them are Americans , the U.S. State Department announced Tuesday .

Despite the growing death toll , aid workers focused Tuesday on the living . The United Nations estimated that 3 million people were in need of food , water , shelter and medical assistance .

Some needed more than that -- they needed rescue . In all , 43 international rescue teams composed of 1,700 people have carried out some 90 rescues , U.N. Secretary General Ban Ki-moon told reporters .

On Tuesday night , a team of New York City Fire Department and Police Department rescuers pulled two children alive from the rubble of a two-story building in the capital . The 8-year-old boy and 10-year-old girl were taken to an Israeli tent hospital .

On Tuesday afternoon , Ena Zizi was rescued from rubble near the national cathedral , CNN 's Anderson Cooper reported .

Her son , Maxime Janvier , told CNN that he never gave up hope that she 'd be found .

`` We were praying a lot for that to happen , '' he told CNN on Tuesday afternoon , about 15 minutes after he learned she 'd been rescued .

Rescue crews said earlier two other survivors may be under the same pile .

PAHO 's Andrus said the need for blood donors was urgent , with the lack of refrigeration complicating medical workers ' ability to store it safely .

The world 's generosity continued to overwhelm the ability of the airport in Port-au-Prince to process it . The result : some badly needed aid was left sitting on the tarmac .

U.S. Army Maj. Daniel Allyn , the deputy commander of the Joint Task Force Unified Response , said flights would be diverted to two alternate ports of entry within the next day or two to relieve the pressure . On an average day before the earthquake , the airport was handling 13 commercial aircraft ; in the days since , it was handling more than 200 , he said .

Some flights were diverting to Santo Domingo , causing congestion issues there , too , Andrus said .

Nevertheless , advances were being made . Many roads that were impassable in the initial aftermath of the quake had been cleared so that supplies could be trucked to those in need , he said . Full coverage l Twitter updates

And some hospitals appeared in better shape -- surgeries resumed Tuesday at University Hospital , the country 's largest , Andrus said . In Washington , U.S. Agency for International Development Administrator Dr. Rajiv Shah told reporters Tuesday night that the U.S. response has been `` swift , aggressive and coordinated . ''

He cited the U.S. donations of 18 water production units providing nearly 2 million liters of drinking water per day and nearly 17 million meals as examples .

The goal of the efforts , he said , `` is to make sure that the things we do collectively as an international community to support the relief effort are as sustainable as possible . ''

At the capital 's general hospital , doctors were working under stressful conditions in buildings located away from the main building , which has been deemed unsafe .

`` We have run out of IVs and IV needles and IV fluids , '' said Dr. Mark Hyman of Partners in Health . `` We 've run out of surgical supplies . We have to wash with vodka and we have to operate with hacksaws because we do n't have enough operating tools . ''

The military is going to help with organization and with supplies , Hyman said . `` They 're going to help us get electricity , they 're going to help us get food , they 're going to help us get tents , they 're going to help us get all the operating supplies in , '' he said .

The United Nations Security Council approved sending an additional 2,000 soldiers and 1,500 police officers to the country and the port is expected to reopen next week , U.N. Secretary Ban said . Fixing the port is a priority , since it is where fuel enters the country . Venezuela 's President Hugo Chavez announced Sunday he will send 225,000 barrels of gasoline and diesel with arrival Thursday at a refinery in the Dominican Republic for use in Haiti .

That represents nearly three weeks worth of fuel if Haiti were to continue the 11,000 barrel-per-day consumption that was typical before the earthquake .

About 2,000 U.S. troops were in Haiti , and more than 5,000 were off-shore on ships , said Maj. Gen. Daniel Allyn , the deputy commander of Joint Task Force Unified Response .

He said the U.S. military anticipated eventually having 10,000 troops in Haiti . `` Our primary purpose is in getting to the population , whether it be the distribution of water , food , or , in this case , where they 've got medical treatment going on and they 're overwhelmed , '' Lt. Gen. P.K. Keen , head of U.S. Southern Command , told CNN . In an interview with CNN 's Amanpour , President Rene Preval applauded the progress aid workers made over the past week in restoring electricity and communication , clearing roads , erecting shelters , distributing food and re-establishing hospitals .

He credited the international community for the aid .

`` Without their help , it would be impossible for us to cope with the situation , '' he said . High-resolution images of damage

Some Haitians welcomed the arrival of U.S. forces . But one man said Haitians needed more relief supplies , not troops or guns .

The United States was conducting medical operations on board a vessel off the coast , the aircraft carrier USS Carl Vinson . And the USS Comfort , a hospital ship , was due to arrive Wednesday , Allyn said .

Outside Haiti , people have contributed more than $ 220 million to major U.S. relief groups , according to The Chronicle of Philanthropy , a newspaper covering nonprofit organizations .

Dozens of Haitian children rescued from an orphanage arrived Tuesday in Pennsylvania to be placed with foster families until adoptions are finalized . Most of the children 's adoption cases were at the end of the bureaucratic process before the earthquake struck .

Occasionally , frustration in Haiti has erupted into violence , as occurred Monday when hundreds of Haitians broke into a damaged store in downtown Port-au-Prince , stripping it clean .

But such incidents have so far been isolated , said Alain Le Roy , the United Nations peacekeeping director .

But such incidents were isolated , Defense Secretary Robert Gates told reporters aboard a plane to India .

`` I saw one reference to that for the last 24 or 48 hours or so . There has been a lot less violence in Port-au-Prince than there was before the earthquake , '' he said .

CNN 's Karl Penhaul , Alec Miran , Gary Tuchman and Justine Redman contributed to this report .

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Woman rescued from rubble Tuesday in Port-au-Prince , seven days after quake

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Haitian authorities record 72,000 deaths so far

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U.S. troops to help get hospital operational , transport people to other hospitals

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People have contributed $ 220 million to charity groups for Haiti relief